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@uitrit tetra atwt @fitte JOEL G. GARRETSON AND FRANKLIN D. CLARK, OFBUFFALO, NEW YORK. Letters Patent No. 71,63, dated December 3, 1867;articolate@ November 19, 1867.

IMPROVED SASH-STOP.

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TO'ALL WHOM IT MAY CONCERN:

Be it known that we, Joni. G. GARRnrsoN and FRANKLIN D. CLARK, of thecity .of Buffalo, in the county of Erie, and State of New York, haveinvented certain new and useful' Improvements in Sash-Locks; and wo doherebydeclare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawings, making partof this specification, in which!- Figure 1 is a section through a.portion of a window-casing, with a portion of the plate of the lockbroken away, showing a front elevation ofthe lock and a portion of thesash.

Figure 2, an edge view of the lock secured in place in `the casing. l

Our invention consists in thecombination of two cams or eccentricsegments. geared together by teeth meshing-into each other, so that whenpartially rota-ted on their axes in one direction their faces are forcedsimultaneously against the sash, holding it both from falling and beingraised; and when turned in the opposite direction, recede therefrom inlike manner, being self-operating in lock, by means of a weightedportion, together with the additional weight of the thumb-lever, andunlock by pressing against said lever; and it further consists in themanner of constructing the case for holding said cams and lever, with acombination of slots or recesses therein, by means of which one side ofsaid case is made to form, by the 'casting of a single plate, both awayor passage in which said thumb-lever moves, and a guard to retain it inposition, instead of the latter being composed ofa separate piece,riveted or otherwise attached, as ordinarily required.

In the drawings, Arepresents. a portion of the side rail of a sash, andB acontiguous portion of the window-casing. C, the case ofthe lock,with-two side plates, between which the two toothed cams or segments D Eare pivoted, by means of pins a a, cast with and projecting from theback plate 6 of the case. The cams mesh together by means Lof teeth c c,and are provided with faces eZ d, of the form shown, both of whichengage with the edge of the sash, as shown in black lines, iig. 1,wedging against it in such a manner as to prevent it being movedineither direction. This cam E is weighted or made heavier at e, thegravity of which, combined with the thumb-lever, presently to bedescribed, causes them to act automatically,lby keeping their faces incon` tact with the edge of the sash, the friction between thecontiguous'surfaces being suiiicient to produce the vnecessary wedging.The sash is released by means of a thumb-lever, F, that is pivoted to`the cam E, by means of aprojecting pin cast therewith, as shown in iig.1 which being pressed in partially rotates the cams, removing theirfaces from contact with the sash,'as clearly represented in the redlines, iig. 1. The weight of this lever also assists the portion e inrendering the lock automatic in its action, as ab'ovc specified. Theside, H, of the ease, or that on which the arm F is pivoted, is eastwith the edge z' ofy the case, and is formed with a portion, f, inrelief or elevated, with recesses`or slots, m s, on each side, to allowthe passage of the arm beneath7 as represented, forming a way for thesame to slide in, while the tongue f operates as a guard to retain it inplace. This elevated portion may be extended to f, where it furtheroperates as a cop or guard to keep the end of the lever engaged with itspivot-pin. I

The lock is inserted in a mortisc formed in the window-casing, and thenfastened by screws 0througl1 the ilangespp, as shown in g. 2. It is castin five pieces, ready to put together without drilling or filing. Asingle rivet, r, may be employed to retain the caso together. Whensecured in the window-casing, it is hid from view except the end ofthethumb-lever, and consequently does not present that ungainlyand'objectionablc appearance which many other kinds do that are attachedon the outside to the casing or sash. It' is easily operated, securelyholds thesash in whatever position required, locking it down, as wellyas holding it up.

The'construction of the plate H of the case, so as to form a way for thearirl F, whilethc tonguefsecures it in place, dispenses with the use ofa separate guard-piece, as is ordinarily required, as well as theexpense ofriveting or otherwise attaching it to the case.

What we claim as o'ur invention, and desire to secure by Letters Patent,is-

The eccentric segments D E, geared together, and self-operating, bymeans of the weighted portion e, vand lever F, arranged and operatingsubstantially as and for the purposes set forth.

. In witness whereof, we have hereunto signed our names in the presenceof two subscribing witnesses. JOEL G. GARRETSON, FRANKLIN D. CLARK.

Witnesses:

JAY HYATT, ALBERT Helena.

